Add solution #2490

Author: JoshCrozier

README.md

@@ -309,6 +309,7 @@
 2427|[Number of Common Factors](./2427-number-of-common-factors.js)|Easy|
 2469|[Convert the Temperature](./2469-convert-the-temperature.js)|Easy|
 2482|[Difference Between Ones and Zeros in Row and Column](./2482-difference-between-ones-and-zeros-in-row-and-column.js)|Medium|
+2490|[Circular Sentence](./2490-circular-sentence.js)|Easy|
 
 ## License
 

solutions/2490-circular-sentence.js

@@ -0,0 +1,32 @@
+/**
+ * 2490. Circular Sentence
+ * https://leetcode.com/problems/circular-sentence/
+ * Difficulty: Easy
+ *
+ * A sentence is a list of words that are separated by a single space with no leading or trailing spaces.
+ *
+ * For example, "Hello World", "HELLO", "hello world hello world" are all sentences.
+ * Words consist of only uppercase and lowercase English letters. Uppercase and lowercase English letters
+ * are considered different.
+ *
+ * A sentence is circular if:
+ * - The last character of a word is equal to the first character of the next word.
+ * - The last character of the last word is equal to the first character of the first word.
+ *
+ * For example, "leetcode exercises sound delightful", "eetcode", "leetcode eats soul" are all circular
+ * sentences. However, "Leetcode is cool", "happy Leetcode", "Leetcode" and "I like Leetcode" are not
+ * circular sentences.
+ *
+ * Given a string sentence, return true if it is circular. Otherwise, return false.
+ */
+
+/**
+ * @param {string} sentence
+ * @return {boolean}
+ */
+var isCircularSentence = function(sentence) {
+  const match = sentence.match(/^\w$|^(\w).*\1$/) !== null;
+  const count = sentence.match(/(\w)(?=\s\1)/g)?.length || 0;
+
+  return match && count === sentence.split(/\s/).length - 1;
+};